Development of Silicon Nitride Radial Turbine Rotors

Watanabe, Keiichiro; Ozawa, Tadao; Kobayashi, Yoshito; Matsuo, Eito

doi:10.1007/978-94-011-2882-7_112

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…Previous references to the creep and rupture of the silicon nitride of this study can be found in the literature. [15][16][17][18][19][20][21][22][23] The data from this study are part of a much larger engineering study of the suitability of monolithic silicon nitride for gas turbine engine applications. 24…”

Section: Introductionmentioning

confidence: 99%

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Tensile Creep and Rupture of Silicon Nitride

Krause

Luecke

French

et al. 1999

Journal of the American Ceramic Society

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We have characterized the tensile creep, rupture lifetime, and cavitation behavior of a commercial, gas-pressuresintered silicon nitride in the temperature range 1150°to 1400°C and stress range 70 to 400 MPa. Individual creep curves generally show primary, secondary, and tertiary creep. The majority of the primary creep is not recoverable. The best representation of the data is one where the creep rate depends exponentially on stress, rather than on the traditional power law. This representation also removes the need to break the data into high and low stress regimes. Cavitation of the interstitial silicate phase accompanies creep under all conditions, and accounts for nearly all of the measured strain. These observations are consistent with a model where creep proceeds by the redistribution of silicate phase from cavitating interstitial pockets, accommodated by grain-boundary sliding of silicon nitride.

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Section: Introductionmentioning

confidence: 99%

“…Note that, although the time axis is logarithmic, the stress axis is linear. Solid lines are the linear fit of Eq (15). to the data.…”

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confidence: 99%

Tensile Creep and Rupture of Silicon Nitride

Krause

Luecke

French

et al. 1999

Journal of the American Ceramic Society

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“…Nonoxide silicon-based ceramics such as Si 3 N4 and SiC are promising candidates for use as structural components in advanced heat engines at temperatures between 1300 and 1500°C. Recently developed materials exhibit remarkably high mechanical properties at elevated temperatures [1][2][3][4]; however their actual application is still limited by their insufficient long term reliability under severe thermal, environmental and mechanical loading conditions. The major limitations determining the long term reliability of silicon nitride and silicon carbide materials is the evolution of damage caused by creep or subcritical crack growth during service at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

High Temperature Oxidation and Corrosion of Silicon-Based Nonoxide Ceramics

Klemm

Herrmann

Schubert

1998

Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation;

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The present study is focussed on the oxidation behavior of nonoxide silicon-based ceramics. Various Si3N4 and SiC ceramics were examined after long term oxidation tests (up to 5000 h) at 1500°C in ambient air. The damage mechanisms were discussed on the basis of a comprehensive chemical and microstructural analysis of the materials after the oxidation tests. The diffusion of oxygen into the material and its further reaction in the bulk of the material were found to be the most critical factors during long term oxidation treatment at elevated temperatures. However, the resulting damage in the microstructure of the materials can be significantly reduced by purposeful microstructural engineering. Using Si3N4/SiC and Si3N4/MoSi2 composite materials provides the possibility to improve the high temperature stability.

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“…With respect to thermal shock resistance R, Si3N4 may generally be superior to SIC because of a happy combination of critical parameters E and a, which are determinants of R, with enhanced ductility. It should be remembered, though, that thermal conductivity, which also has a bearing on R, may vary significantly with material formula and structure (K. Watanabe, 1991) (Table 2).…”

Section: 3a Stationary Components Monolithic Ceramicmentioning

confidence: 99%

Ceramics for Aero-Engine Applications

Wortmann¹,

Prewo²

1992

Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation;

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In the general aero-engine development effort to significantly improve specific fuel consumption as well as thrust-to-weight ratios, ceramics have been under investigation since the mid-Seventies. Their great potential for increasing gas-turbine performance has resulted in a number of research programs worldwide to assess their desirability for static or rotating components. There has been remarkable progress in the drive to improve material strength by especially process control and the clean room approach. This development has been assisted by revised design and lifing methods. Thus static components like hybrid vanes and combustor rings have withstood temperatures of up to 1650 °C for several hundred hours and some ten cycles. But for ceramics, one essential property required of all aero-engine materials — defect tolerance, or the ability to reduce stresses in a controlled manner — still falls short of the standard commonly associated with other materials. Attention is therefore focused on methods of controlling the inherently poor defect tolerance of ceramic materials by appropriate design concepts (small volumes, simple shapes, constant wall thickness, compression stress state) and by strengthening the material proper through fiber reinforcement. Apart from the ambitious application of monolithic or fibrereinforced ceramics as structural components in the hot gas path in extremely high temperature environments, some applications, such as thermal barrier coatings, bearings and flaps, have already reached the production stage.

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Development of Silicon Nitride Radial Turbine Rotors

Cited by 6 publications

References 5 publications

Tensile Creep and Rupture of Silicon Nitride

Tensile Creep and Rupture of Silicon Nitride

High Temperature Oxidation and Corrosion of Silicon-Based Nonoxide Ceramics

Ceramics for Aero-Engine Applications

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